I think much depends on the quality of your gear. My Michelin Axial carbons lasted a good 3,000 miles, and even then I think I could have got some more miles out of them, but tyres are one place I don't like to skimp on safety. I did have some Conti ultra 3000's -dumped them after about 600 miles as the sidewalls were toast and had big cuts in them -all on the exact same roads too as the Michelins -so you see there can be substantial differences in longevity. I'd assume you'll need at least one, possibly two changes of tyres for 7,000 miles.
Gears? Well lubed (there's you long lasting alternative right there!) and a drivechain should last you that long. The other area of concern would be brake pads and possibly cables -keep an eye on them. Again, that's dependent on the type of use and the brake pad manufacturer -Shimano's pads will last several epochs and will be dug up by archeologists in perfect condition in thousands of years time -but then again they won't stop you well either. I use Koolstop salmons that are soft compounds, but I'd think they'd last at least 4,000 miles and for the performance they give you and the cost, they'd be worth it for me for go through 2 pairs.
You might also want to keep an eye on your headset, but there shouldn't be any problem really. Just keep an eye on your bike and keep it in good order. If you aren't mechanically inclined a good thing would be to attend a bike maintenance class or something.